我试图在Firestore中读取一个集合。为此，我想将相应的文档转换到我的POJO类中。但是，我得到了下面列出的错误
我的数据类模型：

data class NewObjektPojo(
val objektHauptBild: String? = "",
val objektName: String? = "",
val objektBeschreibung: String? = "",
val objektBilder: MutableList<String>? = null,
val objektZimmer: Number? = 0,
val objektGroeße: Number? = 0,
val objektPreis: Number? = 0,
val objektLatitude: Double? = null,
val objektLontitude: Double? = null,
)

抛出错误的部分：

db.collectionGroup("Houses").get().addOnSuccessListener { snapshot ->
        for(document in snapshot.documents)
        {
            //mistake happens here
            val house = document.toObject(NewObjektPojo::class.java)
            objektListe.add(house!!)
        }
 }

java.lang.RuntimeException:无法反序列化对象。不支持将值反序列化为Number（在字段"objektGroeße"中找到）
类型应适合：